auxiliary note

Trill, position of auxiliary note in a, 72.

If the half-tone, what would be the name of the auxiliary note?

Position, of the body, 4. of the hand, 6. of the fingers, 6, 8. of the wrist, 10. of the thumb, 16. of the turn over a note, 71. of auxiliary note in a trill, 72.

As the auxiliary note of a trill is ever the diatonic sequel of a stated note it must, in this case, be a whole tone above B-flat, namely C. Since the piece is written in D major there should have been a "natural" marked under the sign of the trill.

Position of Auxiliary Note in a Trill In the accompanying example of the trill should the auxiliary note be a tone or a half-tone above the principal note?